Opencart project

budget is 20euro and only for opencart experts ! opencart marketplace 2.3.0.2 version when admin wants to add a new product need extra tabs to be added as: 1) merchants lists 2) merchants sub categories if any for each selected merchant 3) i need an extra tab module, so admin can save for example shipping methods, payment methods and post to each product. i have a module but everytime need write what you need. so need edit this module to have saved some prefixed tabs. 4) also need a tab where this product is located, worldwide and list of counties to choose. so this must be filtered from the ultimated filter i have instaled so customer can choose if this products located to his country. this tab must installed to front end merchant add product. 5) When Admin visit category to see products need for each product to show merchant name, categories listed, discount prices and easy edit for them. I have also an extension to help you just need some changes.